HEC’s HT50 and HT57 series, as well as Vishay’s TOS 030033 and TOS 020016 series, manufacture RF power barrel capacitors in large volumes. These capacitors are one of the most common types of RF power capacitors (sometimes referred to as “doorknob capacitors”). There are many major applications for anticore antenna emission, high frequency dielectric heating, radio frequency power supplies, radar, and medical equipment.

 COVID19 has prompted many industrial products, such as High Energy Capacitors (HECs) and Vishsy-Dralorics, to cease production. Many manufacturers of RF power supplies and radar equipment have already approved the HVCHF series high voltage HF capacitors as an alternative to RF capacitors.   It has been 70 years since the USSR began producing high-frequency ceramic capacitors in China. China has developed top-of-the-line ceramic dielectric powders like NPO, N750, N4700, Y5T, and X5U. HVC Capacitors uses these dielectric materials for its own brand of RF power barrel capacitors. The main features of this cable are its high rated voltage, low loss, as well as its high reliability. Ceramic capacitors are a type of capacitor used in RF power supplies, induction heating, gem smelting, and radar communications.

A wide range of diameters of HVC RF barrels is available in the HVCHF series. HEC offers RF barrels from Vishay, HEC HT50, HEC HT57, HEC HH57, HEC HT58, HEC HT59, and HEC HT58/HT59 series. Custom sizes can also be requested by customers.


Using a high voltage, how can I test a doorknob capacitor?

To test whether these capacitors are still in good working order, at least 30 should be tested (HEC HT57 100pf 15KVDC N750).

A tank circuit of a Colpitts oscillator prevents me from substituting them one by one. The failure mode may be either: 1) they have become hot or some other reason that caused the silver-soldered connection between the plates to fail, or 2) possible leakage may indicate a breakdown, and explosion.1.8 KW of power is consumed in this load, while the oscillator operates at 22 MHz. The use of a capacitance checker and a static test for leakage at high voltage would not be sufficient to determine whether they are suitable for the job. With a 500mA maximum current and a 40% duty cycle, induction coils are powered by the 5868. In order to know whether I am testing them in accordance with their specifications, I would greatly appreciate some basic instructions on how to conduct this test. Does anyone have any experience with this?

When I Googled test methods for capacitors of this type, I found nothing useful. maybe in series with a resistor or something, and measure it. Do you have any experience with this?

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